Hmm, I seem to be addicted to old M42-lenses. If M42 doesn't ring a bell, check this one out:
en.wikipedia.org/wiki/M42_lens…Currently I own three M42-mount lenses: a Super Takumar 55mm/f1.8, a Vivitar 28mm/f2.8 and a Chinon 135mm/f2.8. Cheap, small, light and durable lenses - and the image quality ain't bad either, especially when considering that these lenses are something like 30 years old! And tomorrow I'll get a Super Takumar 200mm/f4, which will work as a 300mm lens in my 1.5x crop-factor Pentax K20D. Can't wait!